#define _CRT_SECURE_NO_WARNINGS
#pragma warning(disable:6031)

class A
{
public:
	int m_x;

private:
	int m_y;
};

class B : public A
{
public:
	B(int x = 0, int y = 0, int z = 0)
	//	: m_x(x)
	{

	}

private:
	int m_z;
};

int main()
{
	B bb;

	return 0;
}